from a user request:
currently, the “show notifications” setting applies to all accounts.
There are situations where you want to change this setting per account instead, especially after the multi-account notifications feature was introduced.
maybe do not add additional switches, but just treat the existing ones as per-account. this is also true for most other settings, so, it also makes sense from that point of view.
see https://github.com/deltachat/deltachat-android/pull/2464 for some previous discussions